Photographic shutter.



E. H. R. BARTON.

PHOTOGRAPHIC SHUTTER.

APPLICATION FILED MAYZ, 1911.

1 1 4 1 ,68 1 Patented June 1, 1915.

2 SHEETS-SHEET 2.

FIG. 2

WITNESSES {MM INVENTOR game; W-

EDWARD H. R. BARTQN, OE ENGLEWQOD, NEW JERSEY.

BHOTOGRAPHIC SHUTTER.

Application filed May.2, 1911:

To all whom it may concern:

Be it known that I, EDWARD H. R. BAR

'roN, a citizenof: the United States, residing at. Englewood, in the county of Bergen and State of New Jersey,\have invented a new and useful Photographic Shutter, of which the: following is aspecification. A

My, invention relatesto a new form of photographic shutter in which. an exposure is-made by the motion and rearrangement of parts in the opening through which light passes to the sensitive plate, in contradistinctien to the wellknown forms in which the parts pass across the opening or withdraw from, and reenter it; It does not make any essential difference whether the parts slide or are pivoted, or how they move, so long as they progress so that during the exposure, all'zparts of the opening become uncovered. The advantages of: this form of shutterare that all portions of; any. opening, however large, may be exposed. practically simultaneously with a very slight. motion of the moving parts, thus eliminating distortion from photographs of rapidly moving objects, and making this form of shutter in effect many times faster than any other form of shutter while giving the same actual exposure. I attain these objects by the mechanism illustrated in the accompanying drawings, inwhich Figure 1 is an elevation partly in section and partly broken away, showing one form of my shutter, and Fig. 2 is a similar view showing a modification.

In both drawings 1 is the body or case of the shutter.

2 and 3 are moving slides or shutters.

H are slots or openings in slide 2.

55 are slots or openings in slide 3.

6 is a lever which moves the slides 2 and 3.

7 is a stud pivoting lever 6 to the-lug 8 on body 1.

9 is a spring to force lever 6 up.

10 is a stud pivoting spring 9 to lug 8.

11 is a stud to restrain the lower end of ;pring 9.

12 and 13 are links which connect slides 2 H16. 3 respectively, to lever 6.

1 1 is a latch to hold lever 6 down.

15 is a stud pivoting latch 14 to the lug .6 on body 1.

17 is a spring fastened to lug 16 and pressng against latch 14.

18 is a key-or trigger to release the shutter- ?or an exposure.

Specification of Letters Patent.

Patented'June 1., 1915.

Serial No. 624,644;

The shutter is shown closed and set, ready for an exposure. The slides2'and:3nare at their lower positions and the openings-of each are covered by the solid portions of the.

other. The spring 9/ is compressed and tends .to force the lever 6 upward. The said lever is prevented from moving, by the latch 14 which is-held in position by the spring-l7 and which. engages the outer endof' the lever 6. To make an exposure, the trigger 18 is depressed'thus causingthe-latoh 14 to disengage the lever 6. Whenthe said lever, thus released,.moves up under the impulse of the spring hit moves the slides 2 and 3 by means of the connecting-links 12 and 13 respectively. Moreover, the slide 3 will move faster than the slide 2 because its point of connection .to lever: fiislfarthen from the pivot 7, and the openings 55 of slide 3 will be drawn over, register with and pass the openings 4-4 in slide 2. When the slides have completed their travel and come to rest against thecase, the openings of each will be again closed by solid-portions of the ot er.

In order that. the exposure shall be complete and. uniform, it is necessary that the relative speeds of the slides-shall be made to bear proper relations to the sizes of the openings and the widths ofthesolid portions of each. These relations can be worked. out in an infinite numben of combinations, and for slides moving in opposite directions as well as in the same direction, 1

as shown in Fig. 1 and Fig. 2. The proportions shown seem to. be the; most practical and are as follOw-sz-Slide 3. moves twice as fast as slide 2 and. openings 5H5 in slide 3 are one-half the width of openings 4-4 in slide 2. The solid portions 2-2 and the openings 44 of slide 2 are of equal width. The solid portions 33 of slide 3 are three times the width of the openings 5 -5.

As an indefinite variation in the style, number and proportions of parts may be made and the same objects attained in substantially the same manner, I do not desire to be limited to the particular mechanism shown; but

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a photographic shutter, a frame surrounding an opening, sets of slats adapted to completely close said opening, and means 1 to move said sets of slats within said openlng, the slats of each set all moving at the adapted to completely same speed butthe speeds "of the sets being diiferent, so as to 0 en or expose all parts of said opening an to completely close it again, substantially as, and for the purposes set forth.

2. In a photographic shutter, a. frame surrounding an opening, two sets of slats adapted to completely close said opening, and means to move said sets of slats within said opening, the slats of each set all moving at the same speed but the speeds of the two sets being different, so as to open or expose all parts of said opening and to completely close it again, substantially as, and for the purposes set forth. t i

3. In a photographic shutter, a frame surrounding an opening, two sets of slats lose said opening, move said sets of slats within and means to without withdrawing them said opening from it, the slats of each set all moving at the same speed but the speeds of the two sets being different, so as to open or expose all parts of said opening and to completely close it again, substantially as, and for the purposes set forth.

4. In a photographic shutter, a frame surrounding an opening, two sets of slats adapted to completely close said opening, and means to move said sets of slats within said opening without withdrawing them from it, the slats of each set all moving at the same speed but the speeds of the two sets being'dilferent, so as to open or expose all parts of said opening at a plurality of points at the same close it again, substantially as, and for the purposes set forth.

5. In a photographic shutter, more than one'slide, each slide having a plurality of openings, and means to move the said slides at different speeds so as to open andclose the shutter, substantially as, and for the purposes set forth.

6. In a photographic shutter, two or more slides each having a plurality of openings and means to move the said slides at diifer-- and close the shutter,

' openings and time and to completely I slide, means to hold the slides ina closed position, meansito release them and means to Witnesses:

nt speeds, ter, substantially as, and for the purposes set forth. a

Y 7 In aphotographic shutter, two or more so as to open and close the shutspeeds, so as to open and close the shutter,

substantially'as, and for the purposes set forth.

8. In photographic shutter, two slides I each having a plurality of openings, the

width from those in the other slide, and

verselyv proportional to the widths of the openings in the said slides, so as to open substantially as, and for the purposes set forth.

9. In a photographic shutter, two slides each havinga plurality of openings, the said openings and the intervening solid parts being so spaced and proportioned that the openings in each slide may all be completely covered by the solid portionsof theother slide, and means to move the said slides at diiferent speeds, so as to open 'andclose the shutter, substantially as, and forthe pur poses set forth.

10. In a photographic shutter, two slides each having a plurality of openings, the said the intervening solid parts be ing so spaced and proportioned that the openings in each slide mayall be completely covered by the solid portions of the other move them at difi'erent speeds from the said closed position, through an'op'en position to a closed position again, substantially as, and for; the purposes set forth. 7 1 i EDWARD H. n. BARTON.

OLIVER G. WEATHERBY, Enw. E. SAcKnr'r.

openings in each slide being of different 

